/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/DynamicMesh3.h
enumerable object for valid triangle indices suitable for use with range-based for, ie for ( int i :TriangleIndicesItr())
[triangle_iterator](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3\triangle_iterator) TriangleIndicesItr() const